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0 ARCADIS <br />Infrastructure, environment facilities <br />Mr. Robert Zuber <br />Environmental Protection Specialist II <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />Re: Lorencito Canyon Mine (Permit No. C-1996-084) <br />Technical Revision 19 (TR -19), Adequacy Letter <br />Dear Mr. Zuber, <br />ARCADIS U.S., Inc. <br />630 Plaza Drive <br />Suite 200 <br />Highlands Ranch <br />Colorado 80129 <br />Tel 720 344 3500 <br />Fax 720 344 3535 <br />www.arcadis-us.com <br />ENVIRONMENTAL PLANNING <br />AND PERMITTING <br />We are in receipt of your Adequacy Letter for the above referenced Technical Date: <br />Revision to the Lorencito Canyon Mine Permit and provide the following response August 19, 2016 <br />to your concerns. <br />We have completed SEDCAD modeling for the reclaimed mine areas and <br />determined current sediment production under reclaimed vegetation conditions. <br />These sediment volumes have been related to sediment pond configuration to <br />determine storage and cleanout increments. We have revised and attached the <br />following materials for your review and approval and incorporation into the Permit <br />Document: <br />• Updated SEDCAD runs for all existing Ponds <br />• Explanation of SEDCAD Modeling <br />• Update of Figure EX 15-14 (stamped by PE) <br />Please feel free to contact me with any questions or comments, or if you need <br />additional information to process TR -19. <br />Thank you, <br />Jerry Koblitz I Senior Vice President I jerry.koblitz65�arcadis-us.com <br />ARCADIS U.S., Inc. 1 630 Plaza Drive, Suite 100 1 Highlands Ranch, CO 80129 <br />T: 303 471 3438 1 M: 303 819 3312 <br />www.arcadis-us.com <br />Please consider the environment before printing this email. <br />Cc: Ron Thompson <br />Phone: <br />303-819-3312 <br />Email: <br />Jerry.koblitz@arcadis- <br />us.com <br />